CA2208101C - A lid having a cured overprint varnish - Google Patents

A lid having a cured overprint varnish Download PDF

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Publication number
CA2208101C
CA2208101C CA 2208101 CA2208101A CA2208101C CA 2208101 C CA2208101 C CA 2208101C CA 2208101 CA2208101 CA 2208101 CA 2208101 A CA2208101 A CA 2208101A CA 2208101 C CA2208101 C CA 2208101C
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CA
Canada
Prior art keywords
layer
varnish
coating
substrate
lid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA 2208101
Other languages
French (fr)
Other versions
CA2208101A1 (en
Inventor
Barry Gene Calvert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WestRock MWV LLC
Original Assignee
Westvaco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP96302508A priority Critical patent/EP0737593B1/en
Priority to HU9600923A priority patent/HU217876B/en
Priority to CZ19961039A priority patent/CZ294822B6/en
Priority to BR9601342A priority patent/BR9601342A/en
Priority to PL96313729A priority patent/PL179985B1/en
Priority to US08/688,639 priority patent/US5853860A/en
Application filed by Westvaco Corp filed Critical Westvaco Corp
Priority to CA 2208101 priority patent/CA2208101C/en
Priority to US09/118,187 priority patent/US6096384A/en
Publication of CA2208101A1 publication Critical patent/CA2208101A1/en
Application granted granted Critical
Publication of CA2208101C publication Critical patent/CA2208101C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/28—Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303—Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
    • Y10T428/1307—Bag or tubular film [e.g., pouch, flexible food casing, envelope, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/24868—Translucent outer layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/24868—Translucent outer layer
    • Y10T428/24876—Intermediate layer contains particulate material [e.g., pigment, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24934—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including paper layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Thermal Sciences (AREA)
  • Toxicology (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)
  • Wrappers (AREA)
  • Paper (AREA)
  • Paints Or Removers (AREA)

Abstract

This invention relates to paperboard lids having a radiation cured overprint varnish. Such structures of this type, generally, protect the graphics which are printed upon the paperboard lid such that the graphics are not distorted and/or marred during the platen sealing process.

Description

BACKGROUND OF THE INVENTION
This invention relates to paperboard lids having a radiation cured overprint varnish. Such structures of this type, generally, protect the graphics which are printed upon the paperboard lid such that the graphics are. not distorted and/or marred.
Description of the Related art Platen sealing is gaining popularity for attaching paperboard lids to trays following product filling. The benefits of this method include more uniform seals, simpler equipment operation, and the ability to seal through food contamination.
A maior disadvantage with this method is that the heated platen can blemish the outside surface of the lid which contains important sales graphics and, in some cases, UPC symbols. The blemished or marred surface results in an unsatisfactory package appearance and, in some cases, UPC symbols which cannot be scanned.

a It is known, in coating systems, to make use of a varnish layer to protect a printed surface. Exemplary of such prior art is U. S . Patent No. 4,170, 681 ( ~ 681 ) to J. R. Edwards et al . , entitled "Method of Applying a Varnish Layer to a Printed Surface and Product Made Thereby". While the X681 reference teaches the use of a varnish layer to provide a smooth' protective surface for the printed graphics, the nature of the varnish layer is such that it is not heat resistant (mass stable) to temperatures above 163°C (325°F) and also the varnish is not radiation cured.
Consequently, an advantageous overprint varnish would be one which is both heat resistant and radiation cured.
It is apparent from the above that there exists a need in the art for an overprint varnish which is capable of protecting the graphics printed upon the lid, but which at the same time is heat resistant and radiation cured. It is a purpose of this invention to fulfill this and other needs in the art in a manner more apparent to the skilled artisan once given the following disclosure.
SUML~ARY OF THl~ IPVENTI0~1 Generally speaking, this invention fulfills these needs by providing a composite lid having an overprint varnish, comprising a paperboard substrate having first and second sides, a coating of. particulate minerals located exterior to the first side of the substrate, a layer of printed graphics located exterior to the coating of particulate minerals, a coating of a radiation-cured, heat resistant varnish located exterior to the layer of printed graphics, and a layer of a heat sealable barrier material located exterior to the second side of the substrate.
In certain preferred embodiments, the particulate minerals are clay. Also, the varnish coating is cured by either electron beam or ultraviolet radiation.
In another further preferred embodiment, the radiation cured varnish overcoat protects the printed graphics from distortion and/or marring.
The preferred lid, according to this invention, offers the following advantages: lightness in weight; ease of assembly;
good stability; good durability; excellent printed graphics protection; and excellent economy. In fact, in many of the preferred embodiments, these factors of ease of assembly, graphics protection, and economy are optimized to the extent that is considerably higher than heretofore achieved in prior, known composite lids.
According to the present invention then, there is provided a composite lid having an overprint varnish, wherein said composite package is comprised of a paperboard substrate having first and second sides; a coating of particulate minerals located exterior to said first side of said substrate; a layer of printed graphics located exterior to said coating of particulate minerals; a coating of a radiation-cured, heat resistant varnish located exterior to said layer of printed graphics wherein said varnish is mass stable above 163 °C (325 °F) and substantially prevents said layer of printed graphics from being distorted during a platen heat sealing of said composite lid to a vessel and said varnish does not substantially adhere to said platen during said heat sealing;
and a layer of heat sealable barrier material located exterior to said second side of said substrate.
According to another aspect of the present invention, there is also provided a method of constructing a composite lid having an overprint varnish, wherein said method is comprised of the steps of coating a first side of a paperboard substrate with a layer of particulate minerals; printing a layer of graphics substantially over said particulate mineral layer; coating said printed graphics layer with an overcoat of a heat resistant, radiation-cured varnish which is mass stable above 163 °C (325 °F); and coating said second side of said substrate with a heat sealable barrier layer.
BRIEF DESCRIPTION OF THE DRA'4~TING
The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, may be best understood by reference to the following description taken in conjunction with the accompanying drawing FIGURE which is a schematic illustration of a composite lid with a cured overprint varnish, according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Cartons which are used for distributing, marketing, and, in some cases, heating portions of prepared foods are fabricated with a paperboard structural substrate. The basic carton design consists of a vessel to hold the product and a Iid which is at least partially sealed to peripheral flanges extending from the vessel sidewalls. See, for example, commonly assigned U.S.
Patent No. 5, 356, 070 ( '070) to W.R. Rigby, entitled "Partitioned Paperboard Food Tray". The lid may also be integral with the vessel in some cases. See, for example, commonly assigned U.S.
Patent No. 5,228,272 ('272) to B.G. Calvert et al., entitled "Product and Process for Heat Sealing a Paperboard Carton Having Polymer Coating on One Side Only".
The basic substrate material for the present invention is machine-made paperboard which may range in thickness from 0.178 mm to 0.889 mm (from 0.007 to 0.035 inches). The paperboard substrate may be coated on one or both sides with a layer of particulate minerals. The surface of the lid next to the food product must be coated with a material which provides a barrier and is heat sealable to the vessel flanges. Coatings which may provide this are, typically, extruded polymers such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE). Finally, the exterior surface of the lid may be printed with sales graphics such that these graphics are printed onto the particulate mineral layer located on the base substrate.
With this background, and with reference to the FIGURE, there is illustrated composite lid structure 2. Lid 2 includes in part, conventional paperboard substrate 4, conventional barrier coating 6, conventional particulate mineral layer 8, conventional printed graphics layer 10, and radiation-cured overprint varnish layer 12.
As discussed earlier, barrier coating 6 must provide a barrier and be heat sealable to the flanges of the vessel (not shown). See, for example, Figures 1 and 3 of the above-identified ('070) and 0 272) patents, respectively. Preferably, the barrier is constructed of either PET, PP, or PE. Particulate mineral layer 8, preferably, is constructed of clay. Finally, the graphics are printed upon particulate mineral layer 8 by any conventional printing techniques.
It is imperative that during attachment or sealing of the ~ lid to the vessel that the sales graphics 10 should not be .J

distorted or marred. In order to avoid this, radiation-cured overprint varnish layer 12 is placed over printed graphics layer such that layer 12 does not stick to the heated platen and remains mass stable above 163°C (325°F).
Two processes, namely, Electron Beam (EB) and Ultraviolet Curing (UV ) , may be used to produce the radiation-cured overprint varnish layer 12. In the EB process, a coating (having 100 solids) is applied to the substrate in a liquid state following printing of sales graphic layer 10. The coating is then exposed to highly accelerated electrons and reaction occurs in which the chemical bongs in the coating are broken and a new-modified overprint varnish layer 12 is formed. This process is referred to as polymerization. The polymerization causes significant physical changes in the product being treated and results in many desirable characteristics such as heat and scuff resistance.
The UV process is similar in that the coating (having 100 solids) is applied in a liquid state over the printed graphics layer 10. The coating is then exposed to a UV light source.
Photochemical initiators in the coating form free radicals. The free radicals initiate the cross linking of monomers and oligomers, which result in a rapid curing of the overprint varnish layer 12. As with the EB process, a durable overprint varnish layer 12 suitable for platen heat sealing systems is produced.

t With respect to the use of a radiation-cured varnish, the information below clearly indicates the superior performance of the coatings of the present invention (RAD.) as opposed to the conventional coatings (STD.).
The temperature range covered is typical for the applications previously described. The sealing pressure can be much greater. A higher pressure would intensify the problem indicated with the standard coating. The dwell times cover a typical range depending upon the polymer being sealed and the board caliper (thickness).
Equipment: Sentinel Bar 25.4 mm (1.0") Sealer Position of Sample: Printed surface next to heated bar Samples Tested: STD. - Standard water-based ink and varnish RAD. ~ Radiation-cured ink and varnish Pressure: 0.414 MPa (60 psig) Dwell Time: 1 and 3 seconds Grading: 1 - No indication of marring 2 - Slight dulling of surface 3 - Dulling of surface and slight ink picking 4 - Dulling of surface, ink picking, and slight discoloration - Severe discoloration, ink picking, and dulling GRADB
S 1l Ti 0 D
0 S Ti d econd me . wel,~
- ~~~ - me ~ . ecor~

~emQ . C , , 'Q a, ~P' STD . ~ STD . B8D -163 (325) 2 1 2 1 i76 (350) 2 1 3 1 190 (375)- 3 1 3 1 204 (400) 3 1 3 1 218 (425) 3 1 4 1 232 (450) 4 1 5 1 246 (475) 4 1 5 1 260 (500) 5 1 5 2 Once given the above disclosure, sang other features, modifications or improvements will become apparent to the skilled artisan. Such features, modifications or improvements are, therefore, considered to be a part of this invention, the scope of which is to be determined by the following claims.

Claims (8)

1. A composite lid having an overprint varnish, wherein said composite package is comprised of:
a paperboard substrate having first and second sides;
a coating of particulate minerals located exterior to said first side of said substrate;
a layer of printed graphics located exterior to said coating of particulate minerals;
a coating of a radiation-cured, heat resistant varnish located exterior to said layer of printed graphics wherein said varnish is mass stable above 163°C (325 °F) and substantially prevents said layer of printed graphics from being distorted during a platen heat sealing of said composite lid to a vessel and said varnish does not substantially adhere to said platen during said heat sealing; and a layer of heat sealable barrier material located exterior to said second side of said substrate.
2. A composite lid having an overprint varnish, which is used to cover a food-containing tray, wherein said composite lid is comprised of a paperboard substrate having first and second sides;
a coating of particulate minerals located exterior to said first side of said substrate;
a layer of printed graphics located exterior to said coating of particulate minerals;
a coating of a radiation-cured, heat resistant varnish located exterior to said layer of printed graphics, wherein said radiation-cured varnish is mass stable above 325 °F and said varnish substantially prevents said layer of printed graphics from being distorted during a pressure platen heat sealing of said composite lid to a vessel and said varnish does not substantially adhere to said platen during said heat sealing wherein said pressure is at or around 60 psig; and a layer of a heat sealable barrier material located exterior to said second side of said substrate.
3. The composite lid, as in Claims 1 or 2, wherein said lid further comprises a coating of particulate minerals located exterior to said second side of said substrate and interior to said barrier layer.
4. The composite lid, as in Claims 1, 2 or 3 wherein said particulate minerals are comprised of clay.
5. A method of constructing a composite lid having an overprint varnish, wherein said method is comprised of the steps of coating a first side of a paperboard substrate~with a layer of particulate minerals;
printing a layer of graphics substantially over said particulate mineral layer;
coating said printed graphics layer with an overcoat of a heat resistant, radiation-cured varnish which is mass stable above 163 °C (325 °F ) ; and coating said second side of said substrate with a heat sealable barrier layer.
6. A method of constructing a composite lid having an overprint varnish which is used to cover a food-containing tray, wherein said method is consisting essentially of the steps of:
coating a first side of a paperboard substrate with a layer of particulate minerals;
printing a layer of graphics substantially over said particulate mineral layer;

coating said printed graphics layer with an overcoat of a heat resistant, radiation-cured varnish having 100% solids, wherein said varnish is mass stable above 325 °F and said varnish substantially prevents said layer of printed graphics from being distorted during a pressure platen heat-sealing of said lid to a vessel at a pressure of at least 60 psig and said varnish does not substantially adhere to said platen during said heat sealing; and coating a second side of said substrate with a heat sealable barrier layer.
7. The method of Claims 5 or 6, wherein said varnish coating step is further comprised of the step of radiating said varnish coating with an electron beam.
8. The method of claims 5 or 6, wherein said varnish coating step is further comprised of the step of radiating said varnish coating with an ultraviolet beam.
CA 2208101 1995-04-12 1997-06-16 A lid having a cured overprint varnish Expired - Fee Related CA2208101C (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
CZ19961039A CZ294822B6 (en) 1995-04-12 1996-04-10 Composite lid and process for producing thereof
EP96302508A EP0737593B1 (en) 1995-04-12 1996-04-10 A lid having a cured overprint varnish
HU9600923A HU217876B (en) 1995-04-12 1996-04-10 A lid having a cured overprint varnish
PL96313729A PL179985B1 (en) 1995-04-12 1996-04-12 Multiple-layer covering lid and method of making same
BR9601342A BR9601342A (en) 1995-04-12 1996-04-12 Composite cover featuring overprint varnish and its construction process
US08/688,639 US5853860A (en) 1995-04-12 1996-07-29 Lid having a cured overprint varnish
CA 2208101 CA2208101C (en) 1995-04-12 1997-06-16 A lid having a cured overprint varnish
US09/118,187 US6096384A (en) 1995-04-12 1998-07-17 Method for producing a lid having a cured overprint varnish

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42077595A 1995-04-12 1995-04-12
CA 2208101 CA2208101C (en) 1995-04-12 1997-06-16 A lid having a cured overprint varnish

Publications (2)

Publication Number Publication Date
CA2208101A1 CA2208101A1 (en) 1998-12-16
CA2208101C true CA2208101C (en) 2004-08-17

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Also Published As

Publication number Publication date
EP0737593B1 (en) 2001-10-31
HU9600923D0 (en) 1996-05-28
HU217876B (en) 2000-04-28
BR9601342A (en) 1998-01-13
EP0737593A2 (en) 1996-10-16
US6096384A (en) 2000-08-01
CZ294822B6 (en) 2005-03-16
PL179985B1 (en) 2000-11-30
PL313729A1 (en) 1996-10-14
EP0737593A3 (en) 1997-11-19
US5853860A (en) 1998-12-29
CZ103996A3 (en) 1996-11-13
HUP9600923A3 (en) 1998-04-28
HUP9600923A2 (en) 1997-06-30
CA2208101A1 (en) 1998-12-16

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